Sawmill-block



UNITED STATES PATENT OFFICE.

H. WELLS, OF FLORANGE, MASSACHUSETTS.

SAWMILL-BLOCK.

Specification of Letters Patent No. 20,910, dated July 13, 1858.

To aZZ rwhom t may concern:

Be it known that I, HIRAM WELLS, of Florance, in the county of Hampshireand State of Massachusetts, have invented a new and ImprovedSelf-Setting Sawmill-Block; and I do hereby declare that the followingis a full, clear, and eXact description of the same, reference being hadto the annexed drawings, making a part of this specification, in which-Figure 1, is a side view of a sawmill carriage wit-h my inventionapplied to it. Fig. 2, is a vertical section of the block and carriage,taken in the line m, Fig. 3. F ig.l 3, is a plan or top view of ditto.Fig. 4, is a detached inverted plan of the mechanism which is attachedto the under side of the dog bar.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to an improvement in sawmill blocks for whichLetters Patent were granted to me June 9th, 1857. In this patent of theabove date the dogs of both the head and tail blocks were operatedsimultaneously by means of a rack bar connected to the dog bars by meansof levers, racks, pawls, etc., arranged so as to form a comparativelycomplicated device.

The object of the within described invention is to attain the same endsby a simpler arrangement of parts, less liable to get out of repair andmore economical to construct, as

whole length of the bar D, as shown hereinafter shown and described.

To enable those skilled in the art to fully understand and construct myinvention I will proceed to describe it.

A, A, represent the two parallel longitudinal timbers of a sawmillcarriage and B, B, are traverse pieces, the carriage being constructedin the usual way.

C, is a block placed transversely on the carriage and secured to it byany proper means. The block C, is grooved longitudinally its wholelength and a sliding bar D, is tted therein and allowed to work freelyback and forth. On the upper surface of the bar D, a longitudinal ledgeor rib a, is formed, said ledge or rib extending the clearly in Fig. 3.One end of the bar D, has a pin b, projecting vertically down from itsunder'. side. This pin b, fits in an oblique slot c, which is made in ahorizontalplate E, attached to a bar F, said bar being fitted insuitable guides d, d, attached to the side of one of the bars A, of thecarriage, the bar F, being allowed to slide freely in its bearings.

The bar F, has a rack e, formed on its upper edge at one end and asegment f, gears into said rack, the segment being at the lower end of alever G, which is pivoted to a small upright projection g, on thecarriage. The movement of lever G, as regards the length of itsvibration is controlled by stops ZL, L, on a curved plate H, attached tothe carriage. One of the stops z, may be made adjustable.

I, represents the dog bar which is fitted in a dove tail groove z', inthe block C. The usual dog is attached to this bar I. In the under sideof the bar I, a longitudinal groove j, is made and a small lever 7c, isfitted transversely in the under side of the bar I, said lever having arecess Z, made in it to receive the ledge or rib a, on the bar D. Thelever 7c, works in a fulcrum pin m, and a spiral spring n, is attachedto it, said spring having a tendency to keep the lever la, out of aright angular position relatively with the rib or ledge a, and causesaid lever to grasp the rib or ledge, in consequence of the edges of therecess binding against the sides of the same. This will be understood byreferring to Fig. 4, in which the rib or ledge or rather its positionrelatively with the lever Zt', is shown in red.

In the groove j, in the bar I, a rod E', is placed. This rod has a lip0, formed at its inner end and projecting downward over the lever' lo.The outer end of the rod projects upward at the end of the dog bar I,and serves as a handle.

There are two blocks C, attached to the carriage, one at each end. Theyare both constructed precisely alike and the bars D, of both areconnected with the bar F.

By shoving the upper end of the lever G, in the direction indicated byarrow Z, the bar D, willbe moved, through the medium of bar F, andslotted plate E, in the direction of arrow 2, see Figs. 3 and 4, theposition of lever la, permitting such movement without affecting the dogbarI. But if the upper end of lever G, be moved in the directionindicated by arrow 3, the bar D, will be moved as indicated by arrow 4,and the dog bar I, will be moved with it, as the lever lc, owing to itsposition as previously described serves as a clutch, the rib or ledge a,binding in the recess Z, of said lever. The log therefore which securedby a dog to bar I-, at each movement of the lever G, in

Yare precisely alike in every respect.

the direction indicated by arrow 3, will be fed laterally to the saWsothat stuff may be saWed from it of the desired thickness, the thicknessdepending on the extent of the movement of lever G, which movement mayb-e varied as desired by adjusting one of the stops z. It Will beunderstod that the log is moved bodily toward the saw as both ends ofthe log are moved simultaneously the dog bars of both blocks being'connected by the same mechanism With the bar F. One block is onlyrepresented in the drawings, one being sufficient as both The lever G,may be moved automatically at the termination of each stroke of thecarriage by any simple means. The carriage is operated so that the logis fed longitudinally to the saw by the usual arrangement of means. rlhedog bar I, may be drawn back- Ward or in a direction opposite to that inwhich it Was fed to the saw, by merely grasping the handle J, the lip 0,of said rod freeing the lever 7c, from the rib a, of the bar D.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is,

Operating the dog bar I, of the block C, by means of the lever k, fittedin the under side of said bar, the ribbed plate D, connected With thebar F, by the obliquely slotted plate E, and pin b, the Whole beingarranged and applied to the carriage substantially as and for thepurpose set forth.

HIRAM WELLS.

Vitnesses:

D. C. TENNEY, HIRAM STEBBINS.

